Flash-light lamp.



F. DAVID. FLASH L|GHT"LAMP- AFPLICATION FILED SEPT-13. 1916.

Patented Jan; 23,1917.

FIGA.

of the slot. When the light is to be turned off, lever Q() will be moved to the other end of slot 23, during which movement the lever will be sprung away from its true line of travel on its pivot 21, by passage through the curvature 3D, so'that the lever'w'ill be held in place at the end of the slot. Accordingly there will be no electric circuit through the battery until the lever 20 is moved with force sufticient to' overcome the 'resistance offered by the curvature 30 of the slot 23.

I-Iaving described my invention,'what I claim is@ 1. A portable lamp, comprising a cylindrical casing linclosing an electric battery; an electric laxnp connected to the casing and to one pole of 'the battery; a rotatable removable cap having ascrew thread adapted for elet-tri al engagement with "a screw thread formed on said cylindrical casing; said cap having lan insulatedv contact adapted :to be forced against the other pole of said battery by means of said screw threads when said cap is rotated, said=cap having a manually operative lever pivoted thereto and in electric connection therewith and adapted to be thrown into or out ofen-4 gagenient with said contact, whereby said lamp inlay be alternately lighted or eX- tinguished. A

21 A portable lamp, comprising a cylindrical casing having an electric lainp mounted in one end thereofi one contact of the la'lnp being electrically connectedv to the casing; the other end of the easing being open; an electric battery adapted to be placed in Said open end of the casing in such a manner that one pole ot the battery vcan make Contact with the other contact of said lamp; a rotatable len'iovable cap havingu screw thread .adapted for electrical engagementy with a screw thread formed on said open end of the cylindrical easing;

said cap having an insulated contact prei '5'4'5v by serving to hold the battery against said .50

lamp; said cap having a manually operative lever pivoted thereto and in electric connection therewith and adapted to be thrown into or out of engagement with'said contact, whereby said lamp may be alternately lighted or extinguished.

A\ portable lamp, comprising a cylindrical casing inclosing an electrical battery; an electric lanip connected to the Casing and to one pole ol`l the battery; a rotatable removable rap having a screw thread adapted for electrical engagement with a screw thread formed on said cylindrical casing; said cap having an insulated contact adapted to be forced against the other pole of said battery by means of said screw threads when said eap is rotated; adjusting meansI for preventing rotating of said cap; said cap `having' a manually' operative lever pivoted thereto and in electric connection therewith and adapted to be thrown into or out of engagement with said contact,' whereb v said lamp may be alteri-iately lighted or extinguished. l

Signed at New York city in the county of New )forli and State ol New York this 12th day of September A. D. 1916.

' FRIEDRICH DAVID. 

